Overseas sewing-machine



(No Medal.) 3 Sheets-Sheet 1.

F. MALSGH.

OVERSEAM SEWING MACHINE.

N0. 602,993. Patented Apr. 26, 1898.

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(Nd Model.) 3 SheetsSheet 2, F. MALSGH. OVERSEAM SEWING MACHINE.

No. 602,993. Patented Apr. 26, 1898.

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(No Model.) 3 Sheets-Sheet 3.

F. MALSOH. OVERSEAM SEWING MACHINE.

No. 602,993. Patented Apr. 26, 1898.

UNITED STATES FRANK MALSOl-I, OF PHILADELPHIA,

PATENT @rrrca.

PENNSYLVANIA, ASSIGNOR. TO THE OVERSEAM SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 602,993, dated April 26, 1898.

Application filed March 13, 1897.

T0 02% whom it may concern:

Be it known that I, FRANK MALscH, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Overseam Sewing-Machines,of which the following is a speci fication.

My invention relates to sewing-machinesv adapted to bind the edges of knit or other fabrics to prevent them from raveling or fringing; and the objects thereof are to provide a machine which is simple in construction and operation and which, therefore, may be run at a very high speed-up to three thousand five hundred revolutions per minute.

My invention relates also to providing improved looping devices comprising a threadcarrying looper and a loop-spreader, which operate in conjunction with a reciprocating thread-carryin g stitchin g-needle to form lockstitches of two threads over an edge of-a fabric and my invention consists of the improvements hereinafter more fully described, and pointed out in the claims.

A machine embodying my invention has been illustrated in the accompanying drawings, forming part of this specification, in which- Figure l is a top view of my improved sew- -ing-machine,showing the needle-arm,presserfoot, cloth-plate, &c., and also a trimmer. Fig. 2 is a plan view of my improved sewingmachine, having the cloth-plate, throatf plate, and presser-foot removed to better illustrate the improved devices. Fig. 3 is a sectional front elevation of the machine. Fig. 4: is an end view of the same. Figs. 5, 6, and 7 are transverse sections on the lines 5 5, 6 6, and 7 7, respectively, of Fig. 2. Figs. 8, 9, and 10 show in perspective views the various relative positions of stitch-needle, threadcarrying looper, and loop-spreader.

Referring now to the drawings for a further description of my invention, A is the base of themachine, having bearings a for journaling the main shaft B with its drivingpulley Z) and various eccentrics for operating the stitch-forming mechanism, feed, trimmer, and talre-up, as will be more fully described. The stitch-forming mechanism comprises serial No. 627,278. (No model.)

the stitching-needle c, the thread-carrying looper d, and the loop-spreader 6, whose operation will be describedin connection with Figs. 6 to 10 after the mechanism has been explained with reference to Figs. 1 to '7. The needle 0, mounted on the arm 0', receives two motions: first, an up-and-dow11 or oscillating motion with respect to the pivotal end a of the arm a, and a baclr-and-forward motion to aid the feeding of the fabric to be sewed, so that a uniform and even overseamed edge is produced. The arm a is trunnioned at c to a plate 0 which is pivoted at c on the base A of the machine, and the plate 0 together with the trunnion 0 receives oscillatory motion from the main shaft B by the eccentric c and eccentric-rod c, Fig. 7, and the latter is adjustably held to the plate 0 so that the throw of the free edge of the plate-i. 6., the trunnion c -may be increased or decreased.

The needle 0 on the arm 0' receives its upand-down or rather swinging movementabout the trunnion from the eccentric c of the main shaft 13 and eccentric-rod 0 which is connected at c to the arm 0', as will be readily seen from the drawings, especially Figs. 2 and 5.

The feed f is moved in synchronism with the fore-and-backward movement of the needle c, and the barf thereof is secured to the eccentric-strap f Fig. 5, which is hinged at f to the plate 0 while the up-and-down motion of the feed is attained by the eccentric 4 on the main shaft 13 and strap f The thread-carrying looper d is journaled at CZ on a rock-shaft (1 which latter receives its motion from the eccentric d and its strap d Figs. 2 and 6, the rock-shaft 01 being journaled in the standards a and a of the machine-bed. thread-arm d is derived from an eccentric d on the main shaft B and strap d hinged to the standard a of the bed A, which strap d has its free end pivotally attached to the link d connected at d to the arm (I, Fig. 3. The latter not only turns about its pivot d, but its free end (1 is so operated by means of the rock-shaft as to lay or hold the lower thread in certain positions, as will be more fully described.

The loop-spreader e, before mention ed, like The oscillatory movement of the -by the eccentric c and strap 6 the latter being hinged to the post a of the machine-bed A and having its free end pivotally connected to the link 6 Figs. 2, 3, and 4, which connects with the loop-spreader e at e so that the free and crotched end of the latter is moved in two directionsi. 6., in one direction by the rock-shaft e and in the other around the pivot eto properly engage the lower thread and to pass the looper cl on one side for a purpose to be explained.

The cloth-plate 2' is provided with the usual throat-plate 2', provided with slots for the feed f, and the usual tongue i Figs. 8, 9, and 10, which is necessary for the formation of the stitches, as will be more fully described.

The presser-foot p is of usual construction, with the tongue )9, and is held on an arm 19 secured to a rod 19 to which one end of the spiral spring 19 is secured, the other end being in contact with the cloth-plate 11 and so as to force the presser-foot onto or toward the throat-plate d and feed f. g, g, g 9 g, and g are thread-eyes to direct the upper thread a and lower thread Z to the various devices.

G is a rotary take-u p for the thread of usual construction secured to the main shaft B and operated to take up the slack of the thread in forming the stitches.

H H are tension devices of any suitable or preferred construction.

K is a trimming device for trimming the edge of the fabric before it is sewed in by the overseam-stitches produced by the machine.

Although I lay no claim to the trimmer, I think it desirable to brieflystate the construction and operation shown thereof and remark that any other suitable device may be employed. This trimmer comprises the bracket 70, secured to the cloth-plate, an adjustable blade secured by means of a screw to said bracket, and a movable blade 70 The latter is adjustably secured to an arm 76', fastened to the rock-shaft 7& so that as the latter rocks to and fro the blade 70 is operated to act with the stationary blade 70 as a pair of scissors. The rock-shaft 7c is journaled in the studs 10 of the cloth-plate t" and operated through its arm 70 from the main shaft B by means of eccentric 70 and eccentric-strap k hinged at one end to the studs a! of the base A. A spring 7.0 is employed to keep the plate a at all times in contact with the blade k, as will be readily understood by those skilled in the art.

The operation of the stitch-forming mechanism--21 e., the needle 0, thread-carrying looper d, and loop-spreader e to form the overseam-stitches, with the two threads u and Z, as illustrated in Figs. 8 to 10-is as follows:

The upper thread at is led from a spool to the thread-eye 9', then to the tension device H, eye g, aperture 0 of the pivot c in the arm 0, which here serves as a take-up, and to the eye g and stitching-needle c, Fig. 1. The lower thread Z is led from a spool to the eye 9 tension device 11, take-up G, eye 9 to the threadcarrying looper d, Fig. 2.

In Fig. 8 the needle 0 is in its upper position, and the thread 11, thereof, held at one end to the edge of the fabric, is held over the thread-carrying looper d and passes underneath the tongue 1' to the needle 0, while the lower thread Z is held by the edge of the fabric and around such thread a and is led to the eye in the fore end (1 of the looper d, the loop-spreader e being in such position that in moving the same in the direction of the arrow 00 it will engage the thread land pushit over the edge of the fabric and the outside edges of the tongue 1' of the throat-plate t" and the edge of tongue 1) of the presser-foot p and behind the needle 0, as shown in Fig. 9, so that when the parts have moved in positions as shown in Fig. 9 the needle 0 is ready to secure the lower thread Zon the top of the fabric.

As the needle 0 is moving downward the looper d and loop-spreader e move in the direction indicated by the arrows 00 and .90 and come in positions as shown in Fig'lO. The needle 0, as shown in this figure, is on its upward move and forms a loop a of the upper thread t6, and when the looper d moves in the direction of the arrow :0 while the needle moves upward and the loop-spreader e in the direction of the arrow 50 the looper d passes into this loop a and holds the thread a below the tongue 1' of the throat-plate Z, when again the looper d and loop-spreader e are brought into position, as shown in Fig. 8. The stitch formed in this manner is fully shown in Figs. 8 to 10, and as it is well known need not be further described herein.

It will be understood by those skilled in the art to which my invention appertains that modifications may be made in the detail construction of the machine without departing from the spirit of the invention; and,

Having thus described the nature and objects of my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In an overseam sewing-machine, having a reciprocating thread carrying stitchingneedle and its complemental actuating and feed mechanism, the combination with a thread-carrying looper and loop-spreader, of mechanism substantially as set forth for reciprocating said looper from the back of the needle and at an inclination to the travel of the work, and for reciprocating said loopspreader from the front of the needle in an inclined path, that intersects the path of the said looper, whereby said looper and loopspreader are caused to pass each other in close proximity, substantially as and for the purposesset forth.

IIO

2. In an overseani sewing-machine, having a reciprocating thread carrying stitchingneedle, its complemental actuating and feed mechanism and tongued presser foot and throat-plate, the combination with a threadcarrying looper and loop-spreader having a crotched free end, of mechanism substantially as set forth for reciprocating said looper from the back of the needle and at an inclination to the travel of the Work, and for reciprocating said loop-spreader from the front of the needle in. a path that intersects the path of the said looper, whereby said looper and loopspreader are caused to pass each other inclose proximity, so that the free and crotched end of the loop-spreader engages the thread of the loops carried by the looper and carries the same over the top of the presser-foot, where it will be secured by the needle, substantially as and for the purposes set forth.

3. In asewingunachinefin combination with a suitable feeding device, a reciprocating thread-carrying stitching-needle moving in the direction of and with the feed, a throatplate and a presser-foot, a tongue on each of said throat-plate and presser-foot, of a threadcarrying looper, means for moving the said looper on one side of the stitching-needle only, said looper adapted to enter and hold a loop formed by the stitching-needle below the tongue of the throat-plate, a loop-spreader arranged independently of the said looper, means for moving the said loop-spreader in front of the stitching needle, said loopspreader adapted to engage the thread from 3 5 the thread-carrying looper and bring it over the tongue of the throat-plate and presserfoot, so as to be fastened by the upper thread on top of the fabric, substantially as and for the purposes set forth.

4:. In a sewin g-machine,in combination with a main shaft, a suitable feeding device, a reciprocating thread-carrying stitching-needle moving in the direction of and with the feed, a throat-plate and a presser-foot each having a tongue, of a lower right-angular thread-carryin g looper having its thread-carrying extremity moving in an arc and in back of the stitching-needle, a rock-shaft d to which said looper is hinged, a loop-spreader arranged independently of the thread-carrying looper, a rock-shaft c for said loop-spreader, and means such as eccentrics e d on the main shaft and eccentric-straps e d for actuating the said rock-shafts, and eccentrics 6 d straps e d and links 6 d for oscillating the threadcarrying looper and loop-spreader about their pivotal connection with their respective rockshafts, substantially as and for the purposes set forth.

In witness whereof I have hereunto set my signature in the presence of two subscribing witnesses.

FRANK MALSCI-I.

"Witnesses:

HERMANN BORMANN, WM. D. Nuns. 

